i think bill clinton would be a significant asset for the president. in may clinton undercut the obama campaign's main argument that mitt romney's business experience does not qualify him to lead the country. >> a man who's been governor and had a sterling business career crosses the qualification threshold. >> reporter: and back in 2007 when hilary and barack obama went head to head. >> i mean, when's the last time we elected a president based on one year of service in the senate before he started running. >> reporter: in early twoit, obama won iowa. >> i'm here and he's not. >> i can't tell who i'm running against sometimes. >> fast forward four years, clinton gave one of the most rousing speeches in support of obama at the convention. >> i want to nominate a man who's cool on the out siside, b who burns for america on the inside. >> reporter: afterward, obama joked about giving the former president a role in his cabinet. somebody tweeted somebody needs to make him secretary of explaining things. although, they didn't use the word things. >>> mitt ro